7. IRC Method of Design of Flexible Pavements
The chapter outlines the procedures specified by the Indian Roads Congress for the design of flexible pavements based on California Bearing Ratio (CBR) values. It extends the previous design methods to accommodate pavements designed for up to 150 million standard axles (msa) through an analytical approach. Key considerations include traffic characteristics, layer thickness, and material specifications to ensure structural integrity and performance over time.
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What we have learnt
- Flexible pavements are designed based on CBR values and traffic loads.
- The design incorporates an analytical approach allowing for extended durability and performance evaluations.
- Key distress mechanisms include vertical compressive strain, horizontal tensile strain, and pavement deformation.
Key Concepts
- -- California Bearing Ratio (CBR)
- A measure of the strength of subgrade soil used in pavement design.
- -- Flexible Pavements
- Pavements that consist of bituminous surfacing and granular base and sub-base layers.
- -- Tensile Strain
- The stress experienced when a material is stretched, significant in assessing potential pavement cracking.
- -- Vehicle Damage Factor (VDF)
- A multiplier for converting the number of commercial vehicle types into standard axle load repetitions.
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